| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 003/128] scsi: return correct blkprep status code in case scsi_init_io() fails. | Date | Fri, 19 Jun 2020 16:31:37 +0200 |
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From: Johannes Thumshirn <jthumshirn@suse.de>
commit e7661a8e5ce10b5321882d0bbaf3f81070903319 upstream.
When instrumenting the SCSI layer to run into the !blk_rq_nr_phys_segments(rq) case the following warning emitted from the block layer:
blk_peek_request: bad return=-22
This happens because since commit fd3fc0b4d730 ("scsi: don't BUG_ON() empty DMA transfers") we return the wrong error value from scsi_prep_fn() back to the block layer.
[mkp: silenced checkpatch]
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Fixes: fd3fc0b4d730 scsi: don't BUG_ON() empty DMA transfers Cc: <stable@vger.kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> [iwamatsu: - backport for 4.4.y and 4.9.y - Use rq->nr_phys_segments instead of blk_rq_nr_phys_segments] Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/scsi/scsi_lib.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1029,10 +1029,10 @@ int scsi_init_io(struct scsi_cmnd *cmd) struct scsi_device *sdev = cmd->device; struct request *rq = cmd->request; bool is_mq = (rq->mq_ctx != NULL); - int error; + int error = BLKPREP_KILL; if (WARN_ON_ONCE(!rq->nr_phys_segments)) - return -EINVAL; + goto err_exit; error = scsi_init_sgtable(rq, &cmd->sdb); if (error)
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